French President Francois Hollande (C) and Head of the commission "Innovation 2030", Anne Lauvergeon (2ndL) and the mayor of Nanterre Patrick Jarry (2ndR) look at tubes used to grow energy-producing algae, as they visit the headquarters of environmental energy systems company Ennesys in Nanterre, near Paris, October 11, 2013. REUTERS/Ian Langsdon/Pool (FRANCE - Tags: POLITICS SCIENCE TECHNOLOGY)